Carolyn Bertozzi (UC Berkeley) Part 1 Chemical Glycobiology - YouTube
http://www.ibiology.org/ibioseminars/biophysics-chemical-biology/carolyn-bertozzi-part-1.html
Part 1 A large part of an organism's complexity is not encoded by its genome but results from post-translational modification. Glycosylation, or the addition of sugar molecules to a protein is an example of such a modification. These sugars, or glycans, are often complex, branched molecules specific to particular cells. Cell surface glycans determine human blood types, allow viral infections and play a key role in tissue inflammation. See more at http://www.ibioseminars.org